To control namecoind, you need to use the command line, there is no GUI yet, AFAIK.
The commands for namecoind are the same as those for the command line Bitcoin client, bitcoind. The full list of commands can be found here:
https://en.bitcoin.it/wiki/Original_Bitcoin_client/API_Calls_list, also see
http://dot-bit.org/InstallAndConfigureNamecoinI don't use Windows, so I don't know the exact syntax, but it should work like this:
Open the Command Prompt window, navigate to the folder where you saved namecoind and execute these commands:
namecoind.exe getbalance
to see your current balance,
namecoind.exe listreceivedbyaddress 0 true
to see your addresses for receiving namecoins
namecoind.exe sendtoaddress
to send coins and
namecoind.exe help
for a list of commands.
Hope this helps!